Renal Carcinoid Tumour

Carcinoid tumours are low grade malignant neuroendocrine tumours found mainly in small intestine, lungs. However primary carcinoid tumour is not normally present in the kidneys, this being an extremely rare renal malignant neoplasm with less than 100 cases reported so far, with majority of cases being associated with horse shoe kidneys. We describe a 39 years old male who presented with complaint of pain abdomen in left lumbar region, with solid renal mass detected on Computed Tomography. We treated the patient with radical nephrectomy. Pathological examination revealed tumor cells arranged in trabeculae, anastomosing cords, nests with peripheral palisading, and in cribriform pattern. The 'tumor cells showed round to oval nuclei, stippled nuclear chromatin, inconspicuous nucleoli, indistinct cell borders and scant cytoplasm, findings consistent with carcinoid tumour. IHC was positive for synaptophysin, chromogranin, and Panck. The patient has been kept on follow up to look for any local recurrence or systemic metastasis.